Bitumnious oil field development method

FIELD: mining.

SUBSTANCE: bituminous oil filed development method includes construction of production and injection wells with horizontal sections located one above the other in productive reservoir stratum, injection of water vapor into both wells to create permeable zone between horizontal sections, injection of water vapor into the upper injection well and extraction of products from the lower production well. And before commencement of construction, the filed is studied to select areas with gas caps, horizontal sections of the wells are located below the gas cap, and pressure control devices are installed in the wells during construction. Steam injection into both wells and then into the injection well is performed at a pressure not exceeding the pressure in the gas cap.

EFFECT: increase in the oil recovery factor in fileds with gas caps, while reducing costs by eliminating the outbreak of heat carrier into gas caps.

1 dwg, 1 ex

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: system comprises several data acquisition units (one unit per a well subject to risk of boreholes contact) consisting of vibration sensor, amplifier-converter, wireless network and antenna module and personal computer connected to wireless network and having software that includes data receipt unit, multichannel unit for cepstrum calculation, multichannel unit for cepstrum samples storage, multichannel unit for calculating cepstrum correlation, multichannel unit for comparing correlation factors with warning threshold and unit coding data to format of the geological and engineering survey station.

EFFECT: early detection of hazardous contact of a drilled well with existing well and potential change of the drilling path in order to prevent contact of boreholes.

1 dwg

FIELD: mining.

SUBSTANCE: in the process of construction of horizontal well, the deviated hole is drilled through the rocks, descending of the upper casing pipe, cementing the borehole annulus behind the upper casing pipe, drilling the horizontal shaft from the upper casing pipe to the lower oil reservoir, descending of the lower casing pipe with a partial placement of the latter in the lower part of the upper casing pipe, cementing the borehole annulus behind the lower casing pipe, perforation of the horizontal shaft, descending to the upper casing pipe of flow string with a packer with mounting of the packer and the shoe of the flow string in the upper casing pipe over the lower casing pipe, and performing the hydraulic fracturing in the horizontal shaft. As a part of the upper casing pipe in the interval of the upper producing layer the well casing of increased thickness are used, where the packer is placed. During the hydraulic fracturing of the lower oil reservoir the pressure is created over the packer, which is allowed on the upper casing pipe. Then the simultaneous release of pressure above and below the packer is carried out, perforating of the upper casing pipe is carried out in the interval of the upper oil reservoir, and development of the well. The height of the cement sheath between the packer top and the lower oil reservoir is determined from the ratio: LPHFLPOP2, where PHFL is pressure of hydraulic fracturing of the layer, MPa; POP is pressure in the over-packer space in the process of hydraulic fracturing of the layer, MPa; L is the height of the cement sheath between the packer top and the lower oil reservoir, m; 2 is the reliability coefficient of the cement sheath, MPa/m.

EFFECT: elimination of flows in the hydraulic fracturing crack, crushing the production casing above the place of the packer mounting, and reduction of water cut of the excavated product.

1 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: invention is related to alignment devices, in particular, to devices to be used for alignment of drilling rigs to ensure correct direction of drilling. The laser alignment device intended for use with a drilling rig has an extended drilling rod and a drill head unit comprising at least a pair of laser radiating devices mounted independently at the head unit, at that each laser device can be moved only in one plane and is oriented in essence in opposite directions in regard to each other to set the alignment plane, fasteners to fix the drill head unit to the drill rig and a unit with adjustable length to adjust distance between the head unit and drilling rod.

EFFECT: laser adjustment device is made for alignment of the drilling rod direction in regard to survey marks using the scan plane.

25 cl, 21 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and may be used in construction of horizontal wells. The concept of the invention is as follows: horizontal well construction method includes drilling of a vertical section, a curved section and horizontal section, running of the casing pipe to the well and cementing. According to the invention drilling of a horizontal section is made with input to the productive stratum. Production string is run in with filtering lower part having length not less than the depth of input to the productive stratum. The packer is set above the filtering part of the string. A circulation valve is set above the packer and tubular annulus is cemented through the circulation valve. Upon cementing the packer is drilled out and drilling is continued with entry to the below stratum, rising to the productive stratum and drilling in the productive stratum.

EFFECT: improving increase of the production part of the well, area of its supply and increase of the well flow rate.

1 ex, 1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling of heat-injection wells, injection of heat carrier into bed, drilling of vertical drain-extract well at the deposit center, dewatering and drying of bed and product extraction therefrom. Note here that heat-injection two-mouth wells are drilled of horizontal-circular profile in radius equal to that of isometric deposit. Drilling is performed by coiled-tubing process (flexible tube) with using of flexible tube as well casing. Said flexible tube is not cemented. Flexible tube is perforated toward deposit center and to vertical drain-extract well.

EFFECT: efficient extraction of bitumen and increased yield.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of ultraviscous oil deposit includes construction of double-mouth upper injector and lower producer with horizontal sections, which are equipped with strainers having stacked openings. The strainer of the injector horizontal section is divided into two heating areas. Inside the strainer, opposite each heating area, liners with holes are installed, which are run in at ends of pipe strings from mouths of the injector. The liners are fixed rigidly to the respective pipe strings with possibility of hermetic closing or opening of the openings in the injector horizontal section. At the surface inner space of the pipe strings inside the injector are bundled by a pipeline with valves, while tubing-casing annulus of the injector is bundled by suction and discharges pipelines equipped with valves and a steam-generating plant. The pumping unit is bundled by hydraulic lines to tubing-casing annulus of the injector. At closed openings of the strainer at the injector horizontal unit heating of the cross-borehole stratum area is made, viscosity of ultraviscous oil is reduced in the stratum by closed circulation of heat carrier through tubing-casing annulus and inner space of the upper and lower double-mouth wells by the steam-generating plant without injection of the heat carrier to the stratum and heated ultraviscous oil is extracted from the producer. In process of closed circulation of the heat carrier through the injector, when temperature in the extraction area of the producer rises up to the value corresponding to viscosity of ultraviscous oil in the stratum sufficient for its solving by a hydrocarbon solvent the steam-generating plant is switched off and circulation of the heat carrier is stopped. Openings in the strainer of the injector horizontal section are opened by means of their matching to the holes in the liners. Hydrocarbon solvent is pumped by the pumping unit through tubing-casing annulus and strainer to the stratum thus forming a chamber with the solvent in the stratum where heated ultraviscous oil is liquefied. At that heated and liquefied ultraviscous oil is being extracted from the producer. As heated and liquefied ultraviscous oil is extracted, in result of stoppage of steam circulation temperature decreases and viscosity of oil increases in the extraction area up to the value corresponding to viscosity of ultraviscous oil in the stratum insufficient for its solving by hydrocarbon solvent. Thereafter the pumping unit is switched off and openings are closed in the upper double-mount injector by means of their disconnection with liners holes. The steam-generating plant is switched on and circulation of the heat carrier is resumed in the upper double-mouth injector. Further the process is repeated.

EFFECT: excluding water flooding of the stratum and water cut of the extracted oil, potential use of the method at bitumen deposits with thickness of layers up to 5-7 m, even development of the deposit, increasing oil recovery factor.

5 dwg

FIELD: mining.

SUBSTANCE: method comprises determining the direction of carrying out counter-heading drivage using instrumental method, drilling counter-heading drivage, charging and blasting the holes, airing the bottomhole and removal of the exploded rock mass. In one of the counter-heading drivage the hole is drilled in the center of the bottomhole. Before drilling in the counter-heading drivage opposite to it the direction of counter-heading drivage is additionally determined on the greatest degree of exposure of vibration of the surface of the rock mass by the palm of the hand by applying the palm of the hand to the surface of the rock mass in the center and in other parts of the bottomhole.

EFFECT: reduction of costs for counter-heading drivage at their breakthrough by reducing the amount of deviation from the predetermined direction at their breakthrough.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling with the boundaries of one formation of parallel horizontal or inclined horizontal injection wells and production well, injection of heat carrier in injection wells and oil withdrawal from production well. Production well is located at equal distance from injection well bottoms which rules out heat carrier outburst bur allows hydrodynamic communication with injection wells. Injection wells are provided with two parallel channels with filters alternating over production reservoir length. Channels are used for injection of heat carrier while, after reservoir heating, one of said reservoirs is used for in-well product flow towards production well.

EFFECT: higher efficiency.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling of heat injection wells, injection of heat carrier into bed, drilling of drain holes, well dewatering and product sampling. Note here that drilled heat injection wells feature circular shape. Note also that heat-and-mass transfer occurs via forced convection from heat-injection well. Bed product is extracted via vertical drain-production wells by piston displacement of bitumen and thick oil by superheated high-pressure steam from deposit periphery to vertical drain-production well. Flow density is defined by the formula: P=h(Tf-Ts), where P is heat flow through area unit or interface volume; h is heat emission factor; Tf is fluid flow temperature; Ts is solid phase temperature. Note that heating radius is defined by the formula: r=QsCvτπhi, where Qs is volume flow of steam injected in the well, m3/h; Cv is latent specific heat of vaporisation at injection pressure, kJ/kg; τ is time, h; h is productive bed depth, m; i is specific heat content in steam zone at design pressure, kJ/kg.

EFFECT: higher yield, control over heat carrier distribution.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: at construction of a horizontal oil well construction drilling of a vertical wellbore is done through rocks, including unstable clay rocks with entry to a productive formation, running-in of the production casing up to the productive formation, cementing of a borehole annulus and drilling of a horizontal offshoot from the production string. Running-in of a shank with length from the bottomhole up to the depth of unstable clay rocks not less than 50 m, cementing space behind the shank, perforation of the horizontal borehole and hydraulic fracturing in the horizontal borehole with placement of a hydraulic fracturing arrangement in the production string and setting of the packer for hydraulic fracturing and tubing string shoe in the production string over the shank is carried out.

EFFECT: increase of well productivity.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: steam-gas generator for production of oil and gas condensate comprises a closed cabin with steam-gas generator mounted on the gate connected in series to adapter, tubing head, adapter and casing head of the injecting well at the deposit. Besides the generator comprises gas turbine with ejector and regenerator, piston-type compressor, electric board and electric generator coupled to gas turbine. At that the closed cabin with a door and lifting eyes comprises radiator and blower with electric motor in order to cool cooling fluid in combustion chamber of the steam-gas generator, supports with retractable rods for mounting at concrete base, water and fuel tanks placed at the cabin walls, gate couple at one side to piston-type compressor and on the other side to regenerator air duct, gas turbine placed at the cabin roof. The steam-gas generator comprises combustion chamber complete with a jacket for recirculation of cooling fluid in space between walls, with a cover and inlet valve for compressed air heated in the regenerator up to temperature of 600-700°C, outlet valve for discharge of exhaust gas to ejector and gas turbine with outlet pipe connected to inlet pipe of the regenerator or to outlet valve with tube. At that the valve gear includes a cylinder with valve piston and spring having a channel for inlet under the valve piston of compressed air from receiver equipped with return valve coupled to the piston-type compressor. Cylinder has openings for discharge of combustion products into circular cylindrical channel with nozzles installed there for injection of water and generation of stream-gas mixture. The combined nozzle comprises a body with tubes to deliver electrically conducting fluid, which are connected to cylindrical channels placed inside the body in the layer of electrically insulating material in parallel to fuel nozzle; at one side of the tubes there are electrodes connected to pulse generator and on the other side there nozzles directed at angle towards each other and interconnected by blasting chamber of the nozzle with orifice. At that regenerator for compressed air heating is made with start-up fuel nozzle, blower and electric motor.

EFFECT: increased oil recovery of the deposit reservoirs.

6 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to the field of oil industry and can be used for enhanced oil recovery of the reservoir in the development of water-flooded reservoirs with viscous oil and bitumen at a late stage of development. The method comprises opening the reservoir with the ability to transfer the production well into the injection one, the reservoir processing, keeping the hole without any influence, intake of oil from the reservoir. At that a system of microwave electromagnetic generators with radiation frequency of 2.5 GHz is lowered into the injection well, connected to the slot antenna using the feeder. The length of the slot antenna is selected equal to the thickness of the aquifer of the reservoir. In the mode of injection, the water injection into the reservoir is carried out with simultaneous influence on the reservoir with microwave electromagnetic field, the radiation power is determined by the time of heating of the water injected in the downhole to the desired temperature. When filling 5-10% of the volume of the pore space of the formation, the well is maintained, the well is transferred into the production well, and the liquid intake from the production well is carried out.

EFFECT: increase of the effectiveness and economical efficiency of development of water-flooded reservoirs of high-viscosity oil, intensification of oil production in water-flooded reservoirs of high-viscosity oil by increasing the coverage with influence to the reservoir with heating in the bottomhole area of the reservoir of the production wells.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: in a development method for a deposit of high-viscosity oil or bitumen including construction of the upper injector and the lower producer with horizontal sections placed one over the other the above sections are equipped with filters, at that a pipe string of a pipe-in-pipe type with inner spaces isolated from each other by packers is run down to the injector while output openings of the pipe strings are placed in the filter and spread along the length of the horizontal section dividing it into heating zones, injection of a heat carrier through the horizontal injector with the stratum heating, creation of a steam chamber and extraction of the product through the horizontal producer, at that thermograms of the steam chambers are recorded, the heating state is analyzed regarding the evenness of heating and availability of temperature peaks, considering the obtained thermograms even heating of the steam chamber is made by changing the heating zones and delivery of a required quantity of the heat carrier to the respective pipe string in order to exclude the breakthrough of the heat carrier to the producer through the most heated zone, at construction of the injector with a horizontal section for evener heating of the stratum the filters and pipe strings are made with an increased total cross-section area of the openings from the beginning of the horizontal section in the stratum towards the bottomhole. During operation upon a 3-5 time increase in viscosity of the extracted product injection of the heat carrier to the injector is stopped and a gaseous hydrocarbon solvent is injected through the respective pipe string to the heating zone with the least temperature until the temperature of the extracted product is reduced per 10-25%. Thereafter injection cycles of vapour and gaseous hydrocarbon solution to the respective heating zones and product extraction are repeated.

EFFECT: enabling continuous control over the change in viscosity of the extracted product, potential regulation of the injection process, even heating of the stratum, increased output of high-viscosity oil and bitumen with the simultaneous reduction of material costs and energy consumption.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of high-viscosity oil field production with horizontal wells involves drilling of two horizontal wells, injector and producer, in the oil reservoir thickness. Producer is positioned below injector level, steam is injected to the injector and oil is swept from producer, presence of bottom water is checked, and if present, minimum height of producer path above water and oil interface, optimum distance between producer and injector, minimum distance from injector to formation top, and optimum thickness of oil reservoir allowing for parallel position of the producer and injector in the same vertical plane are determined, and if oil reservoir thickness drops below the optimum, injector drilling path in the oil reservoir space against the producer is modified by reducing the vertical distance between the wells, and injector is lead away from the producer in horizontal plane with account of reservoir anisotropy, preserving permeability gradient between the injector and producer.

EFFECT: enhanced efficiency of thermal effect on field with low constant and variable thickness of oil reservoir.

2 tbl, 1 ex, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method upper layer of gas hydrate mass is melted gradually by heating gas hydrate mass in bottom sediments of a water body up to temperature of 50-60°C. Heating is made by a heating element made as blade edge located along diameter of a cargo container lowered from a flotation device. The flotation device is made as a mobile underwater vehicle with retractable tract in the form of a container equipped with blade edge in the bottom part connected to heating elements inside container. Stability of the mobile underwater vehicle is endured in regard to the bottom of the water body. Container is rotated and electric current is supplied to heating elements. Gas hydrate stratum is heated up to 50-60°C. The container is lowered with rotation to the gas hydrate stratum with provision of single-point recovery of hydrates from the above stratum in solid state.

EFFECT: reduced material and operational expenditures and ecological consequences at gas hydrate extraction territory.

2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes production of gas hydrates, their transportation to a consumer and decomposition of gas hydrates with gas recovery. Gas hydrate recovery process is implemented at thermodynamic parameters corresponding to formation of gas hydrates. Transportation of gas hydrates is performed in sealed and heat insulated cargo spaces of a vehicle at thermodynamic parameters excluding decomposition of gas hydrates. Decomposition of gas hydrates with gas recovery upon completed transportation is made by reduction of pressure in cargo space of a vehicle up to atmospheric pressure. Process of gas hydrate recovery and their storage during transportation is carried out at temperature of -0.2°C and pressure of 1 MPa. At that gas hydrates are withdrawn in hydrate state as briquettes by n-containers run down in sequence to submarine reservoir of gas hydrates from a submarine vehicle. The submarine reservoir of gas hydrates is heated up by heating elements located at edges of n-containers. Each n-container is buried in sequence to submarine reservoir of gas hydrates to the depth twice exceeding the container height. Upon loading of each n-container by free falling of gas hydrates they are loaded to cargo space of a vehicle. The vehicle is made as a submarine vessel. While heating submarine reservoir of gas hydrates only reservoir section under the container is heated. Containers are filled with gas hydrates represented by briquettes of natural metastable mineral in hydrate solid state.

EFFECT: improving efficiency in recovery and transportation of gas hydrates due to reduced consumption of energy and reduced capital and current costs.

2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: under method the first device is installed in the horizontal well. Firth fluid is injected in the first horizontal well via the first device. HCs production is ensured from the second horizontal well under the first well. Second fluid is injected to the third well shifted to side from the first and second wells to displace fluids in the reservoir to the second well. At that HC production from the second well is continued. Hydraulic connection is ensured between the first, the second and the third wells. Pressure in the first well is increased using the second fluid injected to the third well. First well is closed when its pressure is increased by the second fluid to pressure sufficient to displace HCs from the second well during HCs production.

EFFECT: increased method efficiency.

29 cl, 10 dwg

FIELD: oil and gas industry.

SUBSTANCE: during execution of the thermoshaft method of high viscous oil production including vapour injection in the oil reservoir, and oil extraction via the production wells, according to the invention the lower layer of the oil reservoir is developed by several horizontal wells drilled from the drilling level of the oil reservoir, steam injection in the lower layer of the reservoirs via the underground system of steam supply, at that the horizontal wells are developed under steam cycle mode, and the underground steam supply system of the further horizontal wells are connected after development of the previous and switching of part of the horizontal wells to the production mode.

EFFECT: creation of the method of high viscous oil production ensuring increased extraction coefficient of the crude oil due to uniform heating of the oil reservoir through height at minimum heat losses per oil production.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves installation of oil-well tubing string with well sucker-rod pump in a well. Additionally, the string features a liner with filter, heating cable along external surface from wellhead to the well sucker-rod pump, capillary well pipeline from wellhead to a depth below the well sucker-rod pump, entering inner space of the liner. Well operation involves simultaneous product extraction through oil-well tubing string by the well sucker-rod pump. Electric current runs over the heating cable. Mix of Intat asphaltene, resin and paraffin sediment solvent and Rekod demulsifier is injected via capillary well pipeline. Demulsifier to solvent ratio is (1:18)-(1:22). Cable with maximum heating temperature up to 105°C and maximum power up to 60 kWh is used as the heating cable.

EFFECT: enhanced efficiency of viscous oil emulsion production.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of high-viscosity oil well development and operation involves landing of tubing string with well pump with power cable to the well, and landing of capillary tube parallel to the power cable and attached to external surface of the tubing string by clamps. Oil or oil-containing reservoir fluid is produced. Chemical reagent is injected to the well from a tank by a metering pump through the capillary tube. Power cable is inserted to the well through cable gland. Power cable and capillary tube are protected against direct contact with internal well surface by protectors. Electric heater with extension unit, well pump with power cable and sleeve with radial hole to which the capillary tube is connected are inserted into the tubing upwards from the bottom at the wellhead. Electric heater extension unit is connected to the power cable of well pump. The tubing is landed to the well so that its shoe is located at least 2 m lower than bottom of high-viscosity oil reservoir, and electric heater is facing perforation interval of the high-viscosity oil reservoir. At the wellhead, power cable is connected to well pump and electric heater control stations and inserted to the well through cable gland. Capillary tube is inserted to the well through sealed side tap of the well X-mas tree. Electric heater is actuated, and a process break is made for 8 hours to heat bottomhole zone of reservoir in the perforation interval and high-viscosity oil heating at the inlet of well pump. After the process break, well pump is launched simultaneously with the metering pump supplying high-viscosity oil flux via the capillary tube through the radial hole in the sleeve to inner space of the tubing above the well pump.

EFFECT: enhanced well yield, reduced load in the well pump.

1 dwg

FIELD: oil extractive industry.

SUBSTANCE: method includes drilling of well and following concurrent heat treatment of productive bed and treatment by pressure waves. Well is drilled in parallel to ceiling or soil of bed. Acoustic properties of system ceiling-bed-soil are examined. Bed oscillation frequencies are determined. Acoustic characteristics of system ceiling-bed-soil are determined and concurrently heat and pressure waves treatment is performed in frequencies range containing spectrum of frequencies in resonance with frequencies of bed oscillations. Length of well is selected divisible by integer number of waves, direction of which is perpendicular to ceiling or bed soil, appropriately to analytical relation.

EFFECT: higher efficiency.

5 cl, 1 ex, 1 tbl, 2 dwg

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